The one on top, the RSD-10, Digital Sampler/Delay.
First working one I ever found (found one a few years ago, dead as a doornail), but this was under a pile of speakers, covered in dust. The store owner wondered how I saw it, he never had. So he said take it for $50 and he just tested it to see if it lit up, but not the sound. But, having had most of this set, I felt it was a good deal, and rarely have I seen a broken one, so I took a gamble. Works a charm. 2000ms, 2sec delay, and this sampler, which so far..
I hooked up ipad to the pad to the keyboard in, and I found it can play the sample waaaaay slower than the delay time. I found one step sounded like 4bit, 10sec stretch. It was way cool. This guy used it alot apparently in the beginning..
I think theres something to this, but Im not sure yet, but I always wanted this, so...pretty cool